nap utility, put this into `~/bin/nap`

nap

#!/bin/bash
if [ -z $1 ]; then
    echo "No time provided. Usage: nap [-cl] [minutes]"
    exit 2
fi
if [[ $1 == *c ]]; then
    echo Cancelling sleep. PIDs \(if any\): `pgrep -f "nap"`
    pkill -f "nap"
    exit 0
fi
if [[ $1 == *l ]]; then
    ps -Af | grep nap
    exit 0
fi
time=$(($1 * 60))
echo Sleeping in $1 minutes...
sleep $time && pmset sleepnow&